The wish asked that people would do research on their factually inaccurate beliefs. If everyone wanted to research if the world would not end on December 8th 2020 that must be a factually inaccurate belief. So basically the world will end on that day as a result of the wish.

Forgive me if I’m being stupid, but how does OPs wish mean that the world would end on that date? As far as I can tell it would just mean that it’s possible for the world to end in that date (which it already is).